Gaya APA

p.rein, D. (1984). grolier intermediate english course 1 . the United States of America: [s.l].Grolier International. Inc.

Gaya MLA

p.rein, David. "grolier intermediate english course 1". the United States of America: [s.l].Grolier International. Inc, 1984. Koleksi Elektronik.